Often you can borrow the “exact equivalent” .img from a LineageOS build of the same Android version or it can be extracted from the main ROM as [Walkthrough] Extract eRecovery and boot images using payload-dumper-go.
Often you can borrow the “exact equivalent” .img from a LineageOS build of the same Android version or it can be extracted from the main ROM as [Walkthrough] Extract eRecovery and boot images using payload-dumper-go.